SPACI score report for 1ab9 in ASTRAL 1.55:

PDB Entry: 1ab9
SPACI score: 0.58
AEROSPACI score: 0.58

Experiment type: XRAY
Resolution: 1.6
R-factor: 0.191
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 0.195
WCK2 WHAT_CHECK Ramachandran: -0.071
WCK3 WHAT_CHECK Chi angles: 0.014
WCK4 WHAT_CHECK Backbone: 1.13

Note: Here are links to pages about PROCHECK and WHAT_CHECK.

Here is the full WHAT_CHECK report on this protein (linked from the WHAT_CHECK site).